/*
+<<<<<<< HEAD
+ Copyright (r) 1997-2016 Sam Lantinga <slouken@libsdl.org>
+=======
Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
+>>>>>>> upstream
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
including commercial applications, and to alter it and redistribute it
freely.
*/
-/* This is a simple example of using GLSL shaders with SDL */
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <math.h>
-#include "SDL.h"
+#ifdef __EMSCRIPTEN__
+#include <emscripten/emscripten.h>
+#endif
-#ifdef HAVE_OPENGL
+#include "SDL_test_common.h"
+#define WINDOW_WIDTH 720
+#define WINDOW_HEIGHT 1280
+#if defined(__IPHONEOS__) || defined(__ANDROID__) || defined(__EMSCRIPTEN__) || defined(__NACL__) \
+ || defined(__WINDOWS__) || defined(__LINUX__) || defined(__TIZEN__)
+#define HAVE_OPENGLES2
+#endif
-#include "SDL_opengl.h"
+#ifdef HAVE_OPENGLES2
-static SDL_bool shaders_supported;
-static int current_shader = 0;
+#include "SDL_opengles2.h"
-enum {
- SHADER_COLOR,
- SHADER_TEXTURE,
- SHADER_TEXCOORDS,
- NUM_SHADERS
-};
+typedef struct GLES2_Context
+{
+#define SDL_PROC(ret,func,params) ret (APIENTRY *func) params;
+#include "SDL_gles2funcs.h"
+#undef SDL_PROC
+} GLES2_Context;
-typedef struct {
- GLhandleARB program;
- GLhandleARB vert_shader;
- GLhandleARB frag_shader;
- const char *vert_source;
- const char *frag_source;
-} ShaderData;
-
-static ShaderData shaders[NUM_SHADERS] = {
-
- /* SHADER_COLOR */
- { 0, 0, 0,
- /* vertex shader */
-"varying vec4 v_color;\n"
-"\n"
-"void main()\n"
-"{\n"
-" gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;\n"
-" v_color = gl_Color;\n"
-"}",
- /* fragment shader */
-"varying vec4 v_color;\n"
-"\n"
-"void main()\n"
-"{\n"
-" gl_FragColor = v_color;\n"
-"}"
- },
-
- /* SHADER_TEXTURE */
- { 0, 0, 0,
- /* vertex shader */
-"varying vec4 v_color;\n"
-"varying vec2 v_texCoord;\n"
-"\n"
-"void main()\n"
-"{\n"
-" gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;\n"
-" v_color = gl_Color;\n"
-" v_texCoord = vec2(gl_MultiTexCoord0);\n"
-"}",
- /* fragment shader */
-"varying vec4 v_color;\n"
-"varying vec2 v_texCoord;\n"
-"uniform sampler2D tex0;\n"
-"\n"
-"void main()\n"
-"{\n"
-" gl_FragColor = texture2D(tex0, v_texCoord) * v_color;\n"
-"}"
- },
-
- /* SHADER_TEXCOORDS */
- { 0, 0, 0,
- /* vertex shader */
-"varying vec2 v_texCoord;\n"
-"\n"
-"void main()\n"
-"{\n"
-" gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;\n"
-" v_texCoord = vec2(gl_MultiTexCoord0);\n"
-"}",
- /* fragment shader */
-"varying vec2 v_texCoord;\n"
-"\n"
-"void main()\n"
-"{\n"
-" vec4 color;\n"
-" vec2 delta;\n"
-" float dist;\n"
-"\n"
-" delta = vec2(0.5, 0.5) - v_texCoord;\n"
-" dist = dot(delta, delta);\n"
-"\n"
-" color.r = v_texCoord.x;\n"
-" color.g = v_texCoord.x * v_texCoord.y;\n"
-" color.b = v_texCoord.y;\n"
-" color.a = 1.0 - (dist * 4.0);\n"
-" gl_FragColor = color;\n"
-"}"
- },
-};
-static PFNGLATTACHOBJECTARBPROC glAttachObjectARB;
-static PFNGLCOMPILESHADERARBPROC glCompileShaderARB;
-static PFNGLCREATEPROGRAMOBJECTARBPROC glCreateProgramObjectARB;
-static PFNGLCREATESHADEROBJECTARBPROC glCreateShaderObjectARB;
-static PFNGLDELETEOBJECTARBPROC glDeleteObjectARB;
-static PFNGLGETINFOLOGARBPROC glGetInfoLogARB;
-static PFNGLGETOBJECTPARAMETERIVARBPROC glGetObjectParameterivARB;
-static PFNGLGETUNIFORMLOCATIONARBPROC glGetUniformLocationARB;
-static PFNGLLINKPROGRAMARBPROC glLinkProgramARB;
-static PFNGLSHADERSOURCEARBPROC glShaderSourceARB;
-static PFNGLUNIFORM1IARBPROC glUniform1iARB;
-static PFNGLUSEPROGRAMOBJECTARBPROC glUseProgramObjectARB;
-
-static SDL_bool CompileShader(GLhandleARB shader, const char *source)
+static SDLTest_CommonState *state;
+static SDL_GLContext *context = NULL;
+static int depth = 16;
+static GLES2_Context ctx;
+
+static int LoadContext(GLES2_Context * data)
{
- GLint status;
-
- glShaderSourceARB(shader, 1, &source, NULL);
- glCompileShaderARB(shader);
- glGetObjectParameterivARB(shader, GL_OBJECT_COMPILE_STATUS_ARB, &status);
- if (status == 0) {
- GLint length;
- char *info;
-
- glGetObjectParameterivARB(shader, GL_OBJECT_INFO_LOG_LENGTH_ARB, &length);
- info = SDL_stack_alloc(char, length+1);
- glGetInfoLogARB(shader, length, NULL, info);
- SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Failed to compile shader:\n%s\n%s", source, info);
- SDL_stack_free(info);
-
- return SDL_FALSE;
- } else {
- return SDL_TRUE;
- }
+#if SDL_VIDEO_DRIVER_UIKIT
+#define __SDL_NOGETPROCADDR__
+#elif SDL_VIDEO_DRIVER_ANDROID
+#define __SDL_NOGETPROCADDR__
+#elif SDL_VIDEO_DRIVER_PANDORA
+#define __SDL_NOGETPROCADDR__
+#endif
+
+#if defined __SDL_NOGETPROCADDR__
+#define SDL_PROC(ret,func,params) data->func=func;
+#else
+#define SDL_PROC(ret,func,params) \
+ do { \
+ data->func = SDL_GL_GetProcAddress(#func); \
+ if ( ! data->func ) { \
+ return SDL_SetError("Couldn't load GLES2 function %s: %s", #func, SDL_GetError()); \
+ } \
+ } while ( 0 );
+#endif /* __SDL_NOGETPROCADDR__ */
+
+#include "SDL_gles2funcs.h"
+#undef SDL_PROC
+ return 0;
}
-static SDL_bool CompileShaderProgram(ShaderData *data)
+/* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
+static void
+quit(int rc)
{
- const int num_tmus_bound = 4;
int i;
- GLint location;
- glGetError();
-
- /* Create one program object to rule them all */
- data->program = glCreateProgramObjectARB();
+ if (context != NULL) {
+ for (i = 0; i < state->num_windows; i++) {
+ if (context[i]) {
+ SDL_GL_DeleteContext(context[i]);
+ }
+ }
- /* Create the vertex shader */
- data->vert_shader = glCreateShaderObjectARB(GL_VERTEX_SHADER_ARB);
- if (!CompileShader(data->vert_shader, data->vert_source)) {
- return SDL_FALSE;
+ SDL_free(context);
}
- /* Create the fragment shader */
- data->frag_shader = glCreateShaderObjectARB(GL_FRAGMENT_SHADER_ARB);
- if (!CompileShader(data->frag_shader, data->frag_source)) {
- return SDL_FALSE;
- }
+ SDLTest_CommonQuit(state);
+ exit(rc);
+}
- /* ... and in the darkness bind them */
- glAttachObjectARB(data->program, data->vert_shader);
- glAttachObjectARB(data->program, data->frag_shader);
- glLinkProgramARB(data->program);
-
- /* Set up some uniform variables */
- glUseProgramObjectARB(data->program);
- for (i = 0; i < num_tmus_bound; ++i) {
- char tex_name[5];
- SDL_snprintf(tex_name, SDL_arraysize(tex_name), "tex%d", i);
- location = glGetUniformLocationARB(data->program, tex_name);
- if (location >= 0) {
- glUniform1iARB(location, i);
+#define GL_CHECK(x) \
+ x; \
+ { \
+ GLenum glError = ctx.glGetError(); \
+ if(glError != GL_NO_ERROR) { \
+ SDL_Log("glGetError() = %i (0x%.8x) at line %i\n", glError, glError, __LINE__); \
+ quit(1); \
+ } \
}
+
+/*
+ * Simulates desktop's glRotatef. The matrix is returned in column-major
+ * order.
+ */
+static void
+rotate_matrix(float angle, float x, float y, float z, float *r)
+{
+ float radians, c, s, c1, u[3], length;
+ int i, j;
+
+ radians = (float)(angle * M_PI) / 180.0f;
+
+ c = SDL_cosf(radians);
+ s = SDL_sinf(radians);
+
+ c1 = 1.0f - SDL_cosf(radians);
+
+ length = (float)SDL_sqrt(x * x + y * y + z * z);
+
+ u[0] = x / length;
+ u[1] = y / length;
+ u[2] = z / length;
+
+ for (i = 0; i < 16; i++) {
+ r[i] = 0.0;
}
- glUseProgramObjectARB(0);
- return (glGetError() == GL_NO_ERROR) ? SDL_TRUE : SDL_FALSE;
-}
+ r[15] = 1.0;
-static void DestroyShaderProgram(ShaderData *data)
-{
- if (shaders_supported) {
- glDeleteObjectARB(data->vert_shader);
- glDeleteObjectARB(data->frag_shader);
- glDeleteObjectARB(data->program);
+ for (i = 0; i < 3; i++) {
+ r[i * 4 + (i + 1) % 3] = u[(i + 2) % 3] * s;
+ r[i * 4 + (i + 2) % 3] = -u[(i + 1) % 3] * s;
+ }
+
+ for (i = 0; i < 3; i++) {
+ for (j = 0; j < 3; j++) {
+ r[i * 4 + j] += c1 * u[i] * u[j] + (i == j ? c : 0.0f);
+ }
}
}
-static SDL_bool InitShaders()
+/*
+ * Simulates gluPerspectiveMatrix
+ */
+static void
+perspective_matrix(float fovy, float aspect, float znear, float zfar, float *r)
{
int i;
+ float f;
- /* Check for shader support */
- shaders_supported = SDL_FALSE;
- if (SDL_GL_ExtensionSupported("GL_ARB_shader_objects") &&
- SDL_GL_ExtensionSupported("GL_ARB_shading_language_100") &&
- SDL_GL_ExtensionSupported("GL_ARB_vertex_shader") &&
- SDL_GL_ExtensionSupported("GL_ARB_fragment_shader")) {
- glAttachObjectARB = (PFNGLATTACHOBJECTARBPROC) SDL_GL_GetProcAddress("glAttachObjectARB");
- glCompileShaderARB = (PFNGLCOMPILESHADERARBPROC) SDL_GL_GetProcAddress("glCompileShaderARB");
- glCreateProgramObjectARB = (PFNGLCREATEPROGRAMOBJECTARBPROC) SDL_GL_GetProcAddress("glCreateProgramObjectARB");
- glCreateShaderObjectARB = (PFNGLCREATESHADEROBJECTARBPROC) SDL_GL_GetProcAddress("glCreateShaderObjectARB");
- glDeleteObjectARB = (PFNGLDELETEOBJECTARBPROC) SDL_GL_GetProcAddress("glDeleteObjectARB");
- glGetInfoLogARB = (PFNGLGETINFOLOGARBPROC) SDL_GL_GetProcAddress("glGetInfoLogARB");
- glGetObjectParameterivARB = (PFNGLGETOBJECTPARAMETERIVARBPROC) SDL_GL_GetProcAddress("glGetObjectParameterivARB");
- glGetUniformLocationARB = (PFNGLGETUNIFORMLOCATIONARBPROC) SDL_GL_GetProcAddress("glGetUniformLocationARB");
- glLinkProgramARB = (PFNGLLINKPROGRAMARBPROC) SDL_GL_GetProcAddress("glLinkProgramARB");
- glShaderSourceARB = (PFNGLSHADERSOURCEARBPROC) SDL_GL_GetProcAddress("glShaderSourceARB");
- glUniform1iARB = (PFNGLUNIFORM1IARBPROC) SDL_GL_GetProcAddress("glUniform1iARB");
- glUseProgramObjectARB = (PFNGLUSEPROGRAMOBJECTARBPROC) SDL_GL_GetProcAddress("glUseProgramObjectARB");
- if (glAttachObjectARB &&
- glCompileShaderARB &&
- glCreateProgramObjectARB &&
- glCreateShaderObjectARB &&
- glDeleteObjectARB &&
- glGetInfoLogARB &&
- glGetObjectParameterivARB &&
- glGetUniformLocationARB &&
- glLinkProgramARB &&
- glShaderSourceARB &&
- glUniform1iARB &&
- glUseProgramObjectARB) {
- shaders_supported = SDL_TRUE;
- }
- }
+ f = 1.0f/SDL_tanf(fovy * 0.5f);
- if (!shaders_supported) {
- return SDL_FALSE;
+ for (i = 0; i < 16; i++) {
+ r[i] = 0.0;
}
- /* Compile all the shaders */
- for (i = 0; i < NUM_SHADERS; ++i) {
- if (!CompileShaderProgram(&shaders[i])) {
- SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Unable to compile shader!\n");
- return SDL_FALSE;
+ r[0] = f / aspect;
+ r[5] = f;
+ r[10] = (znear + zfar) / (znear - zfar);
+ r[11] = -1.0f;
+ r[14] = (2.0f * znear * zfar) / (znear - zfar);
+ r[15] = 0.0f;
+}
+
+/*
+ * Multiplies lhs by rhs and writes out to r. All matrices are 4x4 and column
+ * major. In-place multiplication is supported.
+ */
+static void
+multiply_matrix(float *lhs, float *rhs, float *r)
+{
+ int i, j, k;
+ float tmp[16];
+
+ for (i = 0; i < 4; i++) {
+ for (j = 0; j < 4; j++) {
+ tmp[j * 4 + i] = 0.0;
+
+ for (k = 0; k < 4; k++) {
+ tmp[j * 4 + i] += lhs[k * 4 + i] * rhs[j * 4 + k];
+ }
}
}
- /* We're done! */
- return SDL_TRUE;
+ for (i = 0; i < 16; i++) {
+ r[i] = tmp[i];
+ }
}
-static void QuitShaders()
+/*
+ * Create shader, load in source, compile, dump debug as necessary.
+ *
+ * shader: Pointer to return created shader ID.
+ * source: Passed-in shader source code.
+ * shader_type: Passed to GL, e.g. GL_VERTEX_SHADER.
+ */
+void
+process_shader(GLuint *shader, const char * source, GLint shader_type)
{
- int i;
+ GLint status = GL_FALSE;
+ const char *shaders[1] = { NULL };
+ char buffer[1024];
+ GLsizei length;
+
+ /* Create shader and load into GL. */
+ *shader = GL_CHECK(ctx.glCreateShader(shader_type));
+
+ shaders[0] = source;
- for (i = 0; i < NUM_SHADERS; ++i) {
- DestroyShaderProgram(&shaders[i]);
+ GL_CHECK(ctx.glShaderSource(*shader, 1, shaders, NULL));
+
+ /* Clean up shader source. */
+ shaders[0] = NULL;
+
+ /* Try compiling the shader. */
+ GL_CHECK(ctx.glCompileShader(*shader));
+ GL_CHECK(ctx.glGetShaderiv(*shader, GL_COMPILE_STATUS, &status));
+
+ /* Dump debug info (source and log) if compilation failed. */
+ if(status != GL_TRUE) {
+ ctx.glGetProgramInfoLog(*shader, sizeof(buffer), &length, &buffer[0]);
+ buffer[length] = '\0';
+ SDL_Log("Shader compilation failed: %s", buffer);fflush(stderr);
+ quit(-1);
}
}
-/* Quick utility function for texture creation */
-static int
-power_of_two(int input)
+/* 3D data. Vertex range -0.5..0.5 in all axes.
+* Z -0.5 is near, 0.5 is far. */
+const float _vertices[] =
{
- int value = 1;
+ /* Front face. */
+ /* Bottom left */
+ -0.5, 0.5, -0.5,
+ 0.5, -0.5, -0.5,
+ -0.5, -0.5, -0.5,
+ /* Top right */
+ -0.5, 0.5, -0.5,
+ 0.5, 0.5, -0.5,
+ 0.5, -0.5, -0.5,
+ /* Left face */
+ /* Bottom left */
+ -0.5, 0.5, 0.5,
+ -0.5, -0.5, -0.5,
+ -0.5, -0.5, 0.5,
+ /* Top right */
+ -0.5, 0.5, 0.5,
+ -0.5, 0.5, -0.5,
+ -0.5, -0.5, -0.5,
+ /* Top face */
+ /* Bottom left */
+ -0.5, 0.5, 0.5,
+ 0.5, 0.5, -0.5,
+ -0.5, 0.5, -0.5,
+ /* Top right */
+ -0.5, 0.5, 0.5,
+ 0.5, 0.5, 0.5,
+ 0.5, 0.5, -0.5,
+ /* Right face */
+ /* Bottom left */
+ 0.5, 0.5, -0.5,
+ 0.5, -0.5, 0.5,
+ 0.5, -0.5, -0.5,
+ /* Top right */
+ 0.5, 0.5, -0.5,
+ 0.5, 0.5, 0.5,
+ 0.5, -0.5, 0.5,
+ /* Back face */
+ /* Bottom left */
+ 0.5, 0.5, 0.5,
+ -0.5, -0.5, 0.5,
+ 0.5, -0.5, 0.5,
+ /* Top right */
+ 0.5, 0.5, 0.5,
+ -0.5, 0.5, 0.5,
+ -0.5, -0.5, 0.5,
+ /* Bottom face */
+ /* Bottom left */
+ -0.5, -0.5, -0.5,
+ 0.5, -0.5, 0.5,
+ -0.5, -0.5, 0.5,
+ /* Top right */
+ -0.5, -0.5, -0.5,
+ 0.5, -0.5, -0.5,
+ 0.5, -0.5, 0.5,
+};
- while (value < input) {
- value <<= 1;
- }
- return value;
-}
+const float _colors[] =
+{
+ /* Front face */
+ /* Bottom left */
+ 1.0, 0.0, 0.0, /* red */
+ 0.0, 0.0, 1.0, /* blue */
+ 0.0, 1.0, 0.0, /* green */
+ /* Top right */
+ 1.0, 0.0, 0.0, /* red */
+ 1.0, 1.0, 0.0, /* yellow */
+ 0.0, 0.0, 1.0, /* blue */
+ /* Left face */
+ /* Bottom left */
+ 1.0, 1.0, 1.0, /* white */
+ 0.0, 1.0, 0.0, /* green */
+ 0.0, 1.0, 1.0, /* cyan */
+ /* Top right */
+ 1.0, 1.0, 1.0, /* white */
+ 1.0, 0.0, 0.0, /* red */
+ 0.0, 1.0, 0.0, /* green */
+ /* Top face */
+ /* Bottom left */
+ 1.0, 1.0, 1.0, /* white */
+ 1.0, 1.0, 0.0, /* yellow */
+ 1.0, 0.0, 0.0, /* red */
+ /* Top right */
+ 1.0, 1.0, 1.0, /* white */
+ 0.0, 0.0, 0.0, /* black */
+ 1.0, 1.0, 0.0, /* yellow */
+ /* Right face */
+ /* Bottom left */
+ 1.0, 1.0, 0.0, /* yellow */
+ 1.0, 0.0, 1.0, /* magenta */
+ 0.0, 0.0, 1.0, /* blue */
+ /* Top right */
+ 1.0, 1.0, 0.0, /* yellow */
+ 0.0, 0.0, 0.0, /* black */
+ 1.0, 0.0, 1.0, /* magenta */
+ /* Back face */
+ /* Bottom left */
+ 0.0, 0.0, 0.0, /* black */
+ 0.0, 1.0, 1.0, /* cyan */
+ 1.0, 0.0, 1.0, /* magenta */
+ /* Top right */
+ 0.0, 0.0, 0.0, /* black */
+ 1.0, 1.0, 1.0, /* white */
+ 0.0, 1.0, 1.0, /* cyan */
+ /* Bottom face */
+ /* Bottom left */
+ 0.0, 1.0, 0.0, /* green */
+ 1.0, 0.0, 1.0, /* magenta */
+ 0.0, 1.0, 1.0, /* cyan */
+ /* Top right */
+ 0.0, 1.0, 0.0, /* green */
+ 0.0, 0.0, 1.0, /* blue */
+ 1.0, 0.0, 1.0, /* magenta */
+};
-GLuint
-SDL_GL_LoadTexture(SDL_Surface * surface, GLfloat * texcoord)
+const char* _shader_vert_src =
+" attribute vec4 av4position; "
+" attribute vec3 av3color; "
+" uniform mat4 mvp; "
+" varying vec3 vv3color; "
+" void main() { "
+" vv3color = av3color; "
+" gl_Position = mvp * av4position; "
+" } ";
+
+const char* _shader_frag_src =
+" precision lowp float; "
+" varying vec3 vv3color; "
+" void main() { "
+" gl_FragColor = vec4(vv3color, 1.0); "
+" } ";
+
+typedef struct shader_data
{
- GLuint texture;
- int w, h;
- SDL_Surface *image;
- SDL_Rect area;
- SDL_BlendMode saved_mode;
-
- /* Use the surface width and height expanded to powers of 2 */
- w = power_of_two(surface->w);
- h = power_of_two(surface->h);
- texcoord[0] = 0.0f; /* Min X */
- texcoord[1] = 0.0f; /* Min Y */
- texcoord[2] = (GLfloat) surface->w / w; /* Max X */
- texcoord[3] = (GLfloat) surface->h / h; /* Max Y */
-
- image = SDL_CreateRGBSurface(SDL_SWSURFACE, w, h, 32,
-#if SDL_BYTEORDER == SDL_LIL_ENDIAN /* OpenGL RGBA masks */
- 0x000000FF,
- 0x0000FF00, 0x00FF0000, 0xFF000000
-#else
- 0xFF000000,
- 0x00FF0000, 0x0000FF00, 0x000000FF
-#endif
- );
- if (image == NULL) {
- return 0;
- }
+ GLuint shader_program, shader_frag, shader_vert;
- /* Save the alpha blending attributes */
- SDL_GetSurfaceBlendMode(surface, &saved_mode);
- SDL_SetSurfaceBlendMode(surface, SDL_BLENDMODE_NONE);
-
- /* Copy the surface into the GL texture image */
- area.x = 0;
- area.y = 0;
- area.w = surface->w;
- area.h = surface->h;
- SDL_BlitSurface(surface, &area, image, &area);
-
- /* Restore the alpha blending attributes */
- SDL_SetSurfaceBlendMode(surface, saved_mode);
-
- /* Create an OpenGL texture for the image */
- glGenTextures(1, &texture);
- glBindTexture(GL_TEXTURE_2D, texture);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
- glTexImage2D(GL_TEXTURE_2D,
- 0,
- GL_RGBA, w, h, 0, GL_RGBA, GL_UNSIGNED_BYTE, image->pixels);
- SDL_FreeSurface(image); /* No longer needed */
-
- return texture;
-}
+ GLint attr_position;
+ GLint attr_color, attr_mvp;
+
+ int angle_x, angle_y, angle_z;
-/* A general OpenGL initialization function. Sets all of the initial parameters. */
-void InitGL(int Width, int Height) /* We call this right after our OpenGL window is created. */
+} shader_data;
+
+static void
+Render(unsigned int width, unsigned int height, shader_data* data)
{
- GLdouble aspect;
+ float matrix_rotate[16], matrix_modelview[16], matrix_perspective[16], matrix_mvp[16];
+
+ /*
+ * Do some rotation with Euler angles. It is not a fixed axis as
+ * quaterions would be, but the effect is cool.
+ */
+ rotate_matrix((float)data->angle_x, 1.0f, 0.0f, 0.0f, matrix_modelview);
+ rotate_matrix((float)data->angle_y, 0.0f, 1.0f, 0.0f, matrix_rotate);
- glViewport(0, 0, Width, Height);
- glClearColor(0.0f, 0.0f, 0.0f, 0.0f); /* This Will Clear The Background Color To Black */
- glClearDepth(1.0); /* Enables Clearing Of The Depth Buffer */
- glDepthFunc(GL_LESS); /* The Type Of Depth Test To Do */
- glEnable(GL_DEPTH_TEST); /* Enables Depth Testing */
- glShadeModel(GL_SMOOTH); /* Enables Smooth Color Shading */
+ multiply_matrix(matrix_rotate, matrix_modelview, matrix_modelview);
- glMatrixMode(GL_PROJECTION);
- glLoadIdentity(); /* Reset The Projection Matrix */
+ rotate_matrix((float)data->angle_z, 0.0f, 1.0f, 0.0f, matrix_rotate);
- aspect = (GLdouble)Width / Height;
- glOrtho(-3.0, 3.0, -3.0 / aspect, 3.0 / aspect, 0.0, 1.0);
+ multiply_matrix(matrix_rotate, matrix_modelview, matrix_modelview);
- glMatrixMode(GL_MODELVIEW);
+ /* Pull the camera back from the cube */
+ matrix_modelview[14] -= 2.5;
+
+ perspective_matrix(45.0f, (float)width/height, 0.01f, 100.0f, matrix_perspective);
+ multiply_matrix(matrix_perspective, matrix_modelview, matrix_mvp);
+
+ GL_CHECK(ctx.glUniformMatrix4fv(data->attr_mvp, 1, GL_FALSE, matrix_mvp));
+
+ data->angle_x += 3;
+ data->angle_y += 2;
+ data->angle_z += 1;
+
+ if(data->angle_x >= 360) data->angle_x -= 360;
+ if(data->angle_x < 0) data->angle_x += 360;
+ if(data->angle_y >= 360) data->angle_y -= 360;
+ if(data->angle_y < 0) data->angle_y += 360;
+ if(data->angle_z >= 360) data->angle_z -= 360;
+ if(data->angle_z < 0) data->angle_z += 360;
+
+ GL_CHECK(ctx.glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT));
+ GL_CHECK(ctx.glDrawArrays(GL_TRIANGLES, 0, 36));
}
-/* The main drawing function. */
-void DrawGLScene(SDL_Window *window, GLuint texture, GLfloat * texcoord)
+int done;
+Uint32 frames;
+shader_data *datas;
+
+void loop()
{
- /* Texture coordinate lookup, to make it simple */
- enum {
- MINX,
- MINY,
- MAXX,
- MAXY
- };
-
- glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); /* Clear The Screen And The Depth Buffer */
- glLoadIdentity(); /* Reset The View */
-
- glTranslatef(-1.5f,0.0f,0.0f); /* Move Left 1.5 Units */
-
- /* draw a triangle (in smooth coloring mode) */
- glBegin(GL_POLYGON); /* start drawing a polygon */
- glColor3f(1.0f,0.0f,0.0f); /* Set The Color To Red */
- glVertex3f( 0.0f, 1.0f, 0.0f); /* Top */
- glColor3f(0.0f,1.0f,0.0f); /* Set The Color To Green */
- glVertex3f( 1.0f,-1.0f, 0.0f); /* Bottom Right */
- glColor3f(0.0f,0.0f,1.0f); /* Set The Color To Blue */
- glVertex3f(-1.0f,-1.0f, 0.0f); /* Bottom Left */
- glEnd(); /* we're done with the polygon (smooth color interpolation) */
-
- glTranslatef(3.0f,0.0f,0.0f); /* Move Right 3 Units */
-
- /* Enable blending */
- glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
- glEnable(GL_BLEND);
- glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
-
- /* draw a textured square (quadrilateral) */
- glEnable(GL_TEXTURE_2D);
- glBindTexture(GL_TEXTURE_2D, texture);
- glColor3f(1.0f,1.0f,1.0f);
- if (shaders_supported) {
- glUseProgramObjectARB(shaders[current_shader].program);
+ SDL_Event event;
+ int i;
+ int status;
+
+ /* Check for events */
+ ++frames;
+ while (SDL_PollEvent(&event) && !done) {
+ switch (event.type) {
+ /*case SDL_WINDOWEVENT:
+ switch (event.window.event) {
+ case SDL_WINDOWEVENT_RESIZED:
+ for (i = 0; i < state->num_windows; ++i) {
+ if (event.window.windowID == SDL_GetWindowID(state->windows[i])) {
+ int w, h;
+ status = SDL_GL_MakeCurrent(state->windows[i], context[i]);
+ if (status) {
+ SDLTest_Log("SDL_GL_MakeCurrent(): %s\n", SDL_GetError());
+ break;
+ }
+ // Change view port to the new window dimensions
+ SDL_GL_GetDrawableSize(state->windows[i], &w, &h);
+ ctx.glViewport(0, 0, w, h);
+ state->window_w = event.window.data1;
+ state->window_h = event.window.data2;
+ // Update window content
+ Render(event.window.data1, event.window.data2, &datas[i]);
+ SDL_GL_SwapWindow(state->windows[i]);
+ break;
+ }
+ }
+ break;
+ }*/
+ case SDL_KEYDOWN:
+ if(event.key.keysym.sym == 0)
+ {
+ done = 1;
+ }
+ break;
+ }
+ SDLTest_CommonEvent(state, &event, &done);
}
-
- glBegin(GL_QUADS); /* start drawing a polygon (4 sided) */
- glTexCoord2f(texcoord[MINX], texcoord[MINY]);
- glVertex3f(-1.0f, 1.0f, 0.0f); /* Top Left */
- glTexCoord2f(texcoord[MAXX], texcoord[MINY]);
- glVertex3f( 1.0f, 1.0f, 0.0f); /* Top Right */
- glTexCoord2f(texcoord[MAXX], texcoord[MAXY]);
- glVertex3f( 1.0f,-1.0f, 0.0f); /* Bottom Right */
- glTexCoord2f(texcoord[MINX], texcoord[MAXY]);
- glVertex3f(-1.0f,-1.0f, 0.0f); /* Bottom Left */
- glEnd(); /* done with the polygon */
-
- if (shaders_supported) {
- glUseProgramObjectARB(0);
+ if (!done) {
+ for (i = 0; i < state->num_windows; ++i) {
+ status = SDL_GL_MakeCurrent(state->windows[i], context[i]);
+ if (status) {
+ SDL_Log("SDL_GL_MakeCurrent(): %s\n", SDL_GetError());
+
+ /* Continue for next window */
+ continue;
+ }
+ Render(state->window_w, state->window_h, &datas[i]);
+ SDL_GL_SwapWindow(state->windows[i]);
+ }
}
- glDisable(GL_TEXTURE_2D);
-
- /* swap buffers to display, since we're double buffered. */
- SDL_GL_SwapWindow(window);
+#ifdef __EMSCRIPTEN__
+ else {
+ emscripten_cancel_main_loop();
+ }
+#endif
}
-
-int main(int argc, char **argv)
+int
+main(int argc, char *argv[])
{
- int done;
- SDL_Window *window;
- SDL_Surface *surface;
- GLuint texture;
- GLfloat texcoords[4];
-
- /* Enable standard application logging */
- SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
-
- /* Initialize SDL for video output */
- if ( SDL_Init(SDL_INIT_VIDEO) < 0 ) {
- SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Unable to initialize SDL: %s\n", SDL_GetError());
- exit(1);
+ int fsaa, accel;
+ int value;
+ int i;
+ SDL_DisplayMode mode;
+ Uint32 then, now;
+ int status;
+ shader_data *data;
+
+ /* Initialize parameters */
+ fsaa = 0;
+ accel = 0;
+
+ /* Initialize test framework */
+ state = SDLTest_CommonCreateState(argv, SDL_INIT_VIDEO);
+ state->window_w = WINDOW_WIDTH;
+ state->window_h = WINDOW_HEIGHT;
+ if (!state) {
+ return 1;
+ }
+ for (i = 1; i < argc;) {
+ int consumed;
+
+ consumed = SDLTest_CommonArg(state, i);
+ if (consumed == 0) {
+ if (SDL_strcasecmp(argv[i], "--fsaa") == 0) {
+ ++fsaa;
+ consumed = 1;
+ } else if (SDL_strcasecmp(argv[i], "--accel") == 0) {
+ ++accel;
+ consumed = 1;
+ } else if (SDL_strcasecmp(argv[i], "--zdepth") == 0) {
+ i++;
+ if (!argv[i]) {
+ consumed = -1;
+ } else {
+ depth = SDL_atoi(argv[i]);
+ consumed = 1;
+ }
+ } else {
+ consumed = -1;
+ }
+ }
+ if (consumed < 0) {
+ SDL_Log ("Usage: %s %s [--fsaa] [--accel] [--zdepth %%d]\n", argv[0],
+ SDLTest_CommonUsage(state));
+ quit(1);
+ }
+ i += consumed;
}
- /* Create a 640x480 OpenGL screen */
- window = SDL_CreateWindow( "Shader Demo", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 640, 480, SDL_WINDOW_OPENGL );
- if ( !window ) {
- SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Unable to create OpenGL window: %s\n", SDL_GetError());
- SDL_Quit();
- exit(2);
+ /* Set OpenGL parameters */
+ state->window_flags |= SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE | SDL_WINDOW_BORDERLESS;
+ state->gl_red_size = 5;
+ state->gl_green_size = 5;
+ state->gl_blue_size = 5;
+ state->gl_depth_size = depth;
+ state->gl_major_version = 2;
+ state->gl_minor_version = 0;
+ state->gl_profile_mask = SDL_GL_CONTEXT_PROFILE_ES;
+
+ if (fsaa) {
+ state->gl_multisamplebuffers=1;
+ state->gl_multisamplesamples=fsaa;
+ }
+ if (accel) {
+ state->gl_accelerated=1;
+ }
+ if (!SDLTest_CommonInit(state)) {
+ quit(2);
+ return 0;
}
- if ( !SDL_GL_CreateContext(window)) {
- SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Unable to create OpenGL context: %s\n", SDL_GetError());
- SDL_Quit();
- exit(2);
+ context = (SDL_GLContext *)SDL_calloc(state->num_windows, sizeof(context));
+ if (context == NULL) {
+ SDL_Log("Out of memory!\n");
+ quit(2);
+ }
+
+ /* Create OpenGL ES contexts */
+ for (i = 0; i < state->num_windows; i++) {
+ context[i] = SDL_GL_CreateContext(state->windows[i]);
+ if (!context[i]) {
+ SDL_Log("SDL_GL_CreateContext(): %s\n", SDL_GetError());
+ quit(2);
+ }
}
- surface = SDL_LoadBMP("icon.bmp");
- if ( ! surface ) {
- SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Unable to load icon.bmp: %s\n", SDL_GetError());
- SDL_Quit();
- exit(3);
+ /* Important: call this *after* creating the context */
+ if (LoadContext(&ctx) < 0) {
+ SDL_Log("Could not load GLES2 functions\n");
+ quit(2);
+ return 0;
}
- texture = SDL_GL_LoadTexture(surface, texcoords);
- SDL_FreeSurface(surface);
- /* Loop, drawing and checking events */
- InitGL(640, 480);
- if (InitShaders()) {
- SDL_Log("Shaders supported, press SPACE to cycle them.\n");
+
+
+ if (state->render_flags & SDL_RENDERER_PRESENTVSYNC) {
+ SDL_GL_SetSwapInterval(1);
} else {
- SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Shaders not supported!\n");
+ SDL_GL_SetSwapInterval(0);
}
- done = 0;
- while ( ! done ) {
- DrawGLScene(window, texture, texcoords);
-
- /* This could go in a separate function */
- { SDL_Event event;
- while ( SDL_PollEvent(&event) ) {
- if ( event.type == SDL_QUIT ) {
- done = 1;
- }
- if ( event.type == SDL_KEYDOWN ) {
- if ( event.key.keysym.sym == SDLK_SPACE ) {
- current_shader = (current_shader + 1) % NUM_SHADERS;
- }
- if ( event.key.keysym.sym == SDLK_ESCAPE ) {
- done = 1;
- }
- }
- }
+
+ SDL_GetCurrentDisplayMode(0, &mode);
+ SDL_Log("Screen bpp: %d\n", SDL_BITSPERPIXEL(mode.format));
+ SDL_Log("\n");
+ SDL_Log("Vendor : %s\n", ctx.glGetString(GL_VENDOR));
+ SDL_Log("Renderer : %s\n", ctx.glGetString(GL_RENDERER));
+ SDL_Log("Version : %s\n", ctx.glGetString(GL_VERSION));
+ SDL_Log("Extensions : %s\n", ctx.glGetString(GL_EXTENSIONS));
+ SDL_Log("\n");
+
+ status = SDL_GL_GetAttribute(SDL_GL_RED_SIZE, &value);
+ if (!status) {
+ SDL_Log("SDL_GL_RED_SIZE: requested %d, got %d\n", 5, value);
+ } else {
+ SDL_Log( "Failed to get SDL_GL_RED_SIZE: %s\n",
+ SDL_GetError());
+ }
+ status = SDL_GL_GetAttribute(SDL_GL_GREEN_SIZE, &value);
+ if (!status) {
+ SDL_Log("SDL_GL_GREEN_SIZE: requested %d, got %d\n", 5, value);
+ } else {
+ SDL_Log( "Failed to get SDL_GL_GREEN_SIZE: %s\n",
+ SDL_GetError());
+ }
+ status = SDL_GL_GetAttribute(SDL_GL_BLUE_SIZE, &value);
+ if (!status) {
+ SDL_Log("SDL_GL_BLUE_SIZE: requested %d, got %d\n", 5, value);
+ } else {
+ SDL_Log( "Failed to get SDL_GL_BLUE_SIZE: %s\n",
+ SDL_GetError());
+ }
+ status = SDL_GL_GetAttribute(SDL_GL_DEPTH_SIZE, &value);
+ if (!status) {
+ SDL_Log("SDL_GL_DEPTH_SIZE: requested %d, got %d\n", depth, value);
+ } else {
+ SDL_Log( "Failed to get SDL_GL_DEPTH_SIZE: %s\n",
+ SDL_GetError());
+ }
+ if (fsaa) {
+ status = SDL_GL_GetAttribute(SDL_GL_MULTISAMPLEBUFFERS, &value);
+ if (!status) {
+ SDL_Log("SDL_GL_MULTISAMPLEBUFFERS: requested 1, got %d\n", value);
+ } else {
+ SDL_Log( "Failed to get SDL_GL_MULTISAMPLEBUFFERS: %s\n",
+ SDL_GetError());
+ }
+ status = SDL_GL_GetAttribute(SDL_GL_MULTISAMPLESAMPLES, &value);
+ if (!status) {
+ SDL_Log("SDL_GL_MULTISAMPLESAMPLES: requested %d, got %d\n", fsaa,
+ value);
+ } else {
+ SDL_Log( "Failed to get SDL_GL_MULTISAMPLESAMPLES: %s\n",
+ SDL_GetError());
}
}
- QuitShaders();
- SDL_Quit();
- return 1;
+ if (accel) {
+ status = SDL_GL_GetAttribute(SDL_GL_ACCELERATED_VISUAL, &value);
+ if (!status) {
+ SDL_Log("SDL_GL_ACCELERATED_VISUAL: requested 1, got %d\n", value);
+ } else {
+ SDL_Log( "Failed to get SDL_GL_ACCELERATED_VISUAL: %s\n",
+ SDL_GetError());
+ }
+ }
+
+ datas = (shader_data *)SDL_calloc(state->num_windows, sizeof(shader_data));
+
+ /* Set rendering settings for each context */
+ for (i = 0; i < state->num_windows; ++i) {
+
+ int w, h;
+ status = SDL_GL_MakeCurrent(state->windows[i], context[i]);
+ if (status) {
+ SDL_Log("SDL_GL_MakeCurrent(): %s\n", SDL_GetError());
+
+ /* Continue for next window */
+ continue;
+ }
+ SDL_GL_GetDrawableSize(state->windows[i], &w, &h);
+ ctx.glViewport(0, 0, w, h);
+
+ data = &datas[i];
+ data->angle_x = 0; data->angle_y = 0; data->angle_z = 0;
+
+ /* Shader Initialization */
+ process_shader(&data->shader_vert, _shader_vert_src, GL_VERTEX_SHADER);
+ process_shader(&data->shader_frag, _shader_frag_src, GL_FRAGMENT_SHADER);
+
+ /* Create shader_program (ready to attach shaders) */
+ data->shader_program = GL_CHECK(ctx.glCreateProgram());
+
+ /* Attach shaders and link shader_program */
+ GL_CHECK(ctx.glAttachShader(data->shader_program, data->shader_vert));
+ GL_CHECK(ctx.glAttachShader(data->shader_program, data->shader_frag));
+ GL_CHECK(ctx.glLinkProgram(data->shader_program));
+
+ /* Get attribute locations of non-fixed attributes like color and texture coordinates. */
+ data->attr_position = GL_CHECK(ctx.glGetAttribLocation(data->shader_program, "av4position"));
+ data->attr_color = GL_CHECK(ctx.glGetAttribLocation(data->shader_program, "av3color"));
+
+ /* Get uniform locations */
+ data->attr_mvp = GL_CHECK(ctx.glGetUniformLocation(data->shader_program, "mvp"));
+
+ GL_CHECK(ctx.glUseProgram(data->shader_program));
+
+ /* Enable attributes for position, color and texture coordinates etc. */
+ GL_CHECK(ctx.glEnableVertexAttribArray(data->attr_position));
+ GL_CHECK(ctx.glEnableVertexAttribArray(data->attr_color));
+
+ /* Populate attributes for position, color and texture coordinates etc. */
+ GL_CHECK(ctx.glVertexAttribPointer(data->attr_position, 3, GL_FLOAT, GL_FALSE, 0, _vertices));
+ GL_CHECK(ctx.glVertexAttribPointer(data->attr_color, 3, GL_FLOAT, GL_FALSE, 0, _colors));
+
+ GL_CHECK(ctx.glEnable(GL_CULL_FACE));
+ GL_CHECK(ctx.glEnable(GL_DEPTH_TEST));
+ }
+
+ /* Main render loop */
+ frames = 0;
+ then = SDL_GetTicks();
+ done = 0;
+
+#ifdef __EMSCRIPTEN__
+ emscripten_set_main_loop(loop, 0, 1);
+#else
+ while (!done) {
+ loop();
+ }
+#endif
+
+ /* Print out some timing information */
+ now = SDL_GetTicks();
+ if (now > then) {
+ SDL_Log("%2.2f frames per second\n",
+ ((double) frames * 1000) / (now - then));
+ }
+#if !defined(__ANDROID__) && !defined(__NACL__)
+ quit(0);
+#endif
+ return 0;
}
-#else /* HAVE_OPENGL */
+#else /* HAVE_OPENGLES2 */
int
main(int argc, char *argv[])
{
- SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "No OpenGL support on this system\n");
+ SDL_Log("No OpenGL ES support on this system\n");
return 1;
}
-#endif /* HAVE_OPENGL */
+#endif /* HAVE_OPENGLES2 */
/* vi: set ts=4 sw=4 expandtab: */
projects / platform / upstream / SDL.git / blobdiff