/*

SDL - Simple DirectMedia Layer

Copyright (C) 1997-2010 Sam Lantinga

This library is free software; you can redistribute it and/or

modify it under the terms of the GNU Lesser General Public

License as published by the Free Software Foundation; either

version 2.1 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public

License along with this library; if not, write to the Free Software

Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA

Sam Lantinga

slouken@libsdl.org

*/

#include "SDL_config.h"

#if SDL_VIDEO_RENDER_OGL_ES

#include "SDL_opengles.h"

#include "../SDL_sysrender.h"

#if defined(SDL_VIDEO_DRIVER_PANDORA)

/* Empty function stub to get OpenGL ES 1.x support without */

/* OpenGL ES extension GL_OES_draw_texture supported */

GL_API void GL_APIENTRY

glDrawTexiOES(GLint x, GLint y, GLint z, GLint width, GLint height)

{

return;

}

#endif /* PANDORA */

/* OpenGL ES 1.1 renderer implementation, based on the OpenGL renderer */

/* Used to re-create the window with OpenGL capability */

extern int SDL_RecreateWindow(SDL_Window * window, Uint32 flags);

static const float inv255f = 1.0f / 255.0f;

static SDL_Renderer *GLES_CreateRenderer(SDL_Window * window, Uint32 flags);

static void GLES_WindowEvent(SDL_Renderer * renderer,

const SDL_WindowEvent *event);

static int GLES_CreateTexture(SDL_Renderer * renderer, SDL_Texture * texture);

static int GLES_UpdateTexture(SDL_Renderer * renderer, SDL_Texture * texture,

const SDL_Rect * rect, const void *pixels,

int pitch);

static int GLES_LockTexture(SDL_Renderer * renderer, SDL_Texture * texture,

const SDL_Rect * rect, void **pixels, int *pitch);

static void GLES_UnlockTexture(SDL_Renderer * renderer,

SDL_Texture * texture);

static int GLES_RenderDrawPoints(SDL_Renderer * renderer,

const SDL_Point * points, int count);

static int GLES_RenderDrawLines(SDL_Renderer * renderer,

const SDL_Point * points, int count);

static int GLES_RenderFillRects(SDL_Renderer * renderer,

const SDL_Rect ** rects, int count);

static int GLES_RenderCopy(SDL_Renderer * renderer, SDL_Texture * texture,

const SDL_Rect * srcrect,

const SDL_Rect * dstrect);

static void GLES_RenderPresent(SDL_Renderer * renderer);

static void GLES_DestroyTexture(SDL_Renderer * renderer,

SDL_Texture * texture);

static void GLES_DestroyRenderer(SDL_Renderer * renderer);

SDL_RenderDriver GL_ES_RenderDriver = {

GLES_CreateRenderer,

{

"opengl_es",

(SDL_RENDERER_PRESENTVSYNC | SDL_RENDERER_ACCELERATED),

1,

{SDL_PIXELFORMAT_ABGR8888},

0,

0}

};

typedef struct

{

SDL_GLContext context;

SDL_bool updateSize;

int blendMode;

#ifndef APIENTRY

#define APIENTRY

#endif

SDL_bool useDrawTexture;

SDL_bool GL_OES_draw_texture_supported;

/* OpenGL ES functions */

#define SDL_PROC(ret,func,params) ret (APIENTRY *func) params;

#include "../../video/SDL_glesfuncs.h"

#undef SDL_PROC

} GLES_RenderData;

typedef struct

{

GLuint texture;

GLenum type;

GLfloat texw;

GLfloat texh;

GLenum format;

GLenum formattype;

void *pixels;

int pitch;

} GLES_TextureData;

static void

GLES_SetError(const char *prefix, GLenum result)

{

const char *error;

switch (result) {

case GL_NO_ERROR:

error = "GL_NO_ERROR";

break;

case GL_INVALID_ENUM:

error = "GL_INVALID_ENUM";

break;

case GL_INVALID_VALUE:

error = "GL_INVALID_VALUE";

break;

case GL_INVALID_OPERATION:

error = "GL_INVALID_OPERATION";

break;

case GL_STACK_OVERFLOW:

error = "GL_STACK_OVERFLOW";

break;

case GL_STACK_UNDERFLOW:

error = "GL_STACK_UNDERFLOW";

break;

case GL_OUT_OF_MEMORY:

error = "GL_OUT_OF_MEMORY";

break;

default:

error = "UNKNOWN";

break;

}

SDL_SetError("%s: %s", prefix, error);

}

static int

GLES_LoadFunctions(GLES_RenderData * data)

{

#define SDL_PROC(ret,func,params) \

data->func = func;

#include "../../video/SDL_glesfuncs.h"

#undef SDL_PROC

return 0;

}

SDL_Renderer *

GLES_CreateRenderer(SDL_Window * window, Uint32 flags)

{

SDL_Renderer *renderer;

GLES_RenderData *data;

GLint value;

Uint32 window_flags;

window_flags = SDL_GetWindowFlags(window);

if (!(window_flags & SDL_WINDOW_OPENGL)) {

if (SDL_RecreateWindow(window, window_flags | SDL_WINDOW_OPENGL) < 0) {

return NULL;

}

}

renderer = (SDL_Renderer *) SDL_calloc(1, sizeof(*renderer));

if (!renderer) {

SDL_OutOfMemory();

return NULL;

}

data = (GLES_RenderData *) SDL_calloc(1, sizeof(*data));

if (!data) {

GLES_DestroyRenderer(renderer);

SDL_OutOfMemory();

return NULL;

}

renderer->WindowEvent = GLES_WindowEvent;

renderer->CreateTexture = GLES_CreateTexture;

renderer->UpdateTexture = GLES_UpdateTexture;

renderer->LockTexture = GLES_LockTexture;

renderer->UnlockTexture = GLES_UnlockTexture;

renderer->RenderDrawPoints = GLES_RenderDrawPoints;

renderer->RenderDrawLines = GLES_RenderDrawLines;

renderer->RenderFillRects = GLES_RenderFillRects;

renderer->RenderCopy = GLES_RenderCopy;

renderer->RenderPresent = GLES_RenderPresent;

renderer->DestroyTexture = GLES_DestroyTexture;

renderer->DestroyRenderer = GLES_DestroyRenderer;

renderer->info = GL_ES_RenderDriver.info;

renderer->driverdata = data;

renderer->info.flags = SDL_RENDERER_ACCELERATED;

if (GLES_LoadFunctions(data) < 0) {

GLES_DestroyRenderer(renderer);

return NULL;

}

data->context = SDL_GL_CreateContext(window);

if (!data->context) {

GLES_DestroyRenderer(renderer);

return NULL;

}

if (SDL_GL_MakeCurrent(window, data->context) < 0) {

GLES_DestroyRenderer(renderer);

return NULL;

}

if (flags & SDL_RENDERER_PRESENTVSYNC) {

SDL_GL_SetSwapInterval(1);

} else {

SDL_GL_SetSwapInterval(0);

}

if (SDL_GL_GetSwapInterval() > 0) {

renderer->info.flags |= SDL_RENDERER_PRESENTVSYNC;

}

#if SDL_VIDEO_DRIVER_PANDORA

data->GL_OES_draw_texture_supported = SDL_FALSE;

data->useDrawTexture = SDL_FALSE;

#else

if (SDL_GL_ExtensionSupported("GL_OES_draw_texture")) {

data->GL_OES_draw_texture_supported = SDL_TRUE;

data->useDrawTexture = SDL_TRUE;

} else {

data->GL_OES_draw_texture_supported = SDL_FALSE;

data->useDrawTexture = SDL_FALSE;

}

#endif

data->glGetIntegerv(GL_MAX_TEXTURE_SIZE, &value);

renderer->info.max_texture_width = value;

data->glGetIntegerv(GL_MAX_TEXTURE_SIZE, &value);

renderer->info.max_texture_height = value;

/* Set up parameters for rendering */

data->blendMode = -1;

data->glDisable(GL_DEPTH_TEST);

data->glDisable(GL_CULL_FACE);

data->updateSize = SDL_TRUE;

data->glEnableClientState(GL_VERTEX_ARRAY);

data->glEnableClientState(GL_TEXTURE_COORD_ARRAY);

return renderer;

}

static SDL_GLContext SDL_CurrentContext = NULL;

static int

GLES_ActivateRenderer(SDL_Renderer * renderer)

{

GLES_RenderData *data = (GLES_RenderData *) renderer->driverdata;

SDL_Window *window = renderer->window;

if (SDL_CurrentContext != data->context) {

if (SDL_GL_MakeCurrent(window, data->context) < 0) {

return -1;

}

SDL_CurrentContext = data->context;

}

if (data->updateSize) {

int w, h;

SDL_GetWindowSize(window, &w, &h);

data->glMatrixMode(GL_PROJECTION);

data->glLoadIdentity();

data->glMatrixMode(GL_MODELVIEW);

data->glLoadIdentity();

data->glViewport(0, 0, w, h);

data->glOrthof(0.0, (GLfloat) w, (GLfloat) h, 0.0, 0.0, 1.0);

data->updateSize = SDL_FALSE;

}

return 0;

}

static void

GLES_WindowEvent(SDL_Renderer * renderer, const SDL_WindowEvent *event)

{

GLES_RenderData *data = (GLES_RenderData *) renderer->driverdata;

if (event->event == SDL_WINDOWEVENT_RESIZED) {

/* Rebind the context to the window area and update matrices */

SDL_CurrentContext = NULL;

data->updateSize = SDL_TRUE;

}

}

static __inline__ int

power_of_2(int input)

{

int value = 1;

while (value < input) {

value <<= 1;

}

return value;

}

static int

GLES_CreateTexture(SDL_Renderer * renderer, SDL_Texture * texture)

{

GLES_RenderData *renderdata = (GLES_RenderData *) renderer->driverdata;

GLES_TextureData *data;

GLint internalFormat;

GLenum format, type;

int texture_w, texture_h;

GLenum result;

GLES_ActivateRenderer(renderer);

switch (texture->format) {

case SDL_PIXELFORMAT_ABGR8888:

internalFormat = GL_RGBA;

format = GL_RGBA;

type = GL_UNSIGNED_BYTE;

break;

default:

SDL_SetError("Texture format %s not supported by OpenGL ES",

SDL_GetPixelFormatName(texture->format));

return -1;

}

data = (GLES_TextureData *) SDL_calloc(1, sizeof(*data));

if (!data) {

SDL_OutOfMemory();

return -1;

}

if (texture->access == SDL_TEXTUREACCESS_STREAMING) {

data->pitch = texture->w * SDL_BYTESPERPIXEL(texture->format);

data->pixels = SDL_malloc(texture->h * data->pitch);

if (!data->pixels) {

SDL_OutOfMemory();

SDL_free(data);

return -1;

}

}

texture->driverdata = data;

renderdata->glGetError();

renderdata->glEnable(GL_TEXTURE_2D);

renderdata->glGenTextures(1, &data->texture);

data->type = GL_TEXTURE_2D;

/* no NPOV textures allowed in OpenGL ES (yet) */

texture_w = power_of_2(texture->w);

texture_h = power_of_2(texture->h);

data->texw = (GLfloat) texture->w / texture_w;

data->texh = (GLfloat) texture->h / texture_h;

data->format = format;

data->formattype = type;

renderdata->glBindTexture(data->type, data->texture);

renderdata->glTexParameteri(data->type, GL_TEXTURE_MIN_FILTER,

GL_LINEAR);

renderdata->glTexParameteri(data->type, GL_TEXTURE_MAG_FILTER,

GL_LINEAR);

renderdata->glTexParameteri(data->type, GL_TEXTURE_WRAP_S,

GL_CLAMP_TO_EDGE);

renderdata->glTexParameteri(data->type, GL_TEXTURE_WRAP_T,

GL_CLAMP_TO_EDGE);

renderdata->glTexImage2D(data->type, 0, internalFormat, texture_w,

texture_h, 0, format, type, NULL);

renderdata->glDisable(GL_TEXTURE_2D);

result = renderdata->glGetError();

if (result != GL_NO_ERROR) {

GLES_SetError("glTexImage2D()", result);

return -1;

}

return 0;

}

static void

SetupTextureUpdate(GLES_RenderData * renderdata, SDL_Texture * texture,

int pitch)

{

renderdata->glPixelStorei(GL_UNPACK_ALIGNMENT, 1);

}

static int

GLES_UpdateTexture(SDL_Renderer * renderer, SDL_Texture * texture,

const SDL_Rect * rect, const void *pixels, int pitch)

{

GLES_RenderData *renderdata = (GLES_RenderData *) renderer->driverdata;

GLES_TextureData *data = (GLES_TextureData *) texture->driverdata;

GLenum result;

int bpp = SDL_BYTESPERPIXEL(texture->format);

void * temp_buffer;

void * temp_ptr;

int i;

GLES_ActivateRenderer(renderer);

renderdata->glGetError();

SetupTextureUpdate(renderdata, texture, pitch);

renderdata->glEnable(data->type);

renderdata->glBindTexture(data->type, data->texture);

if( rect->w * bpp == pitch ) {

temp_buffer = (void *)pixels; /* No need to reformat */

} else {

/* Reformatting of mem area required */

temp_buffer = SDL_malloc(rect->w * rect->h * bpp);

temp_ptr = temp_buffer;

for (i = 0; i < rect->h; i++) {

SDL_memcpy(temp_ptr, pixels, rect->w * bpp);

temp_ptr += rect->w * bpp;

pixels += pitch;

}

}

renderdata->glTexSubImage2D(data->type, 0, rect->x, rect->y, rect->w,

rect->h, data->format, data->formattype,

temp_buffer);

if( temp_buffer != pixels ) {

SDL_free(temp_buffer);

}

renderdata->glDisable(data->type);

result = renderdata->glGetError();

if (result != GL_NO_ERROR) {

GLES_SetError("glTexSubImage2D()", result);

return -1;

}

return 0;

}

static int

GLES_LockTexture(SDL_Renderer * renderer, SDL_Texture * texture,

const SDL_Rect * rect, void **pixels, int *pitch)

{

GLES_TextureData *data = (GLES_TextureData *) texture->driverdata;

*pixels =

(void *) ((Uint8 *) data->pixels + rect->y * data->pitch +

rect->x * SDL_BYTESPERPIXEL(texture->format));

*pitch = data->pitch;

return 0;

}

static void

GLES_UnlockTexture(SDL_Renderer * renderer, SDL_Texture * texture)

{

GLES_RenderData *renderdata = (GLES_RenderData *) renderer->driverdata;

GLES_TextureData *data = (GLES_TextureData *) texture->driverdata;

GLES_ActivateRenderer(renderer);

SetupTextureUpdate(renderdata, texture, data->pitch);

renderdata->glEnable(data->type);

renderdata->glBindTexture(data->type, data->texture);

renderdata->glTexSubImage2D(data->type, 0, 0, 0, texture->w,

texture->h, data->format, data->formattype,

data->pixels);

renderdata->glDisable(data->type);

}

static void

GLES_SetBlendMode(GLES_RenderData * data, int blendMode)

{

if (blendMode != data->blendMode) {

switch (blendMode) {

case SDL_BLENDMODE_NONE:

data->glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);

data->glDisable(GL_BLEND);

break;

case SDL_BLENDMODE_BLEND:

data->glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);

data->glEnable(GL_BLEND);

data->glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

break;

case SDL_BLENDMODE_ADD:

data->glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);

data->glEnable(GL_BLEND);

data->glBlendFunc(GL_SRC_ALPHA, GL_ONE);

break;

case SDL_BLENDMODE_MOD:

data->glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);

data->glEnable(GL_BLEND);

data->glBlendFunc(GL_ZERO, GL_SRC_COLOR);

break;

}

data->blendMode = blendMode;

}

}

static int

GLES_RenderDrawPoints(SDL_Renderer * renderer, const SDL_Point * points,

int count)

{

GLES_RenderData *data = (GLES_RenderData *) renderer->driverdata;

int i;

GLshort *vertices;

GLES_ActivateRenderer(renderer);

GLES_SetBlendMode(data, renderer->blendMode);

data->glColor4f((GLfloat) renderer->r * inv255f,

(GLfloat) renderer->g * inv255f,

(GLfloat) renderer->b * inv255f,

(GLfloat) renderer->a * inv255f);

vertices = SDL_stack_alloc(GLshort, count*2);

for (i = 0; i < count; ++i) {

vertices[2*i+0] = (GLshort)points[i].x;

vertices[2*i+1] = (GLshort)points[i].y;

}

data->glVertexPointer(2, GL_SHORT, 0, vertices);

data->glDrawArrays(GL_POINTS, 0, count);

SDL_stack_free(vertices);

return 0;

}

static int

GLES_RenderDrawLines(SDL_Renderer * renderer, const SDL_Point * points,

int count)

{

GLES_RenderData *data = (GLES_RenderData *) renderer->driverdata;

int i;

GLshort *vertices;

GLES_ActivateRenderer(renderer);

GLES_SetBlendMode(data, renderer->blendMode);

data->glColor4f((GLfloat) renderer->r * inv255f,

(GLfloat) renderer->g * inv255f,

(GLfloat) renderer->b * inv255f,

(GLfloat) renderer->a * inv255f);

vertices = SDL_stack_alloc(GLshort, count*2);

for (i = 0; i < count; ++i) {

vertices[2*i+0] = (GLshort)points[i].x;

vertices[2*i+1] = (GLshort)points[i].y;

}

data->glVertexPointer(2, GL_SHORT, 0, vertices);

if (count > 2 &&

points[0].x == points[count-1].x && points[0].y == points[count-1].y) {

/* GL_LINE_LOOP takes care of the final segment */

--count;

data->glDrawArrays(GL_LINE_LOOP, 0, count);

} else {

data->glDrawArrays(GL_LINE_STRIP, 0, count);

}

SDL_stack_free(vertices);

return 0;

}

static int

GLES_RenderFillRects(SDL_Renderer * renderer, const SDL_Rect ** rects,

int count)

{

GLES_RenderData *data = (GLES_RenderData *) renderer->driverdata;

int i;

GLES_ActivateRenderer(renderer);

GLES_SetBlendMode(data, renderer->blendMode);

data->glColor4f((GLfloat) renderer->r * inv255f,

(GLfloat) renderer->g * inv255f,

(GLfloat) renderer->b * inv255f,

(GLfloat) renderer->a * inv255f);

for (i = 0; i < count; ++i) {

const SDL_Rect *rect = rects[i];

GLshort minx = rect->x;

GLshort maxx = rect->x + rect->w;

GLshort miny = rect->y;

GLshort maxy = rect->y + rect->h;

GLshort vertices[8];

vertices[0] = minx;

vertices[1] = miny;

vertices[2] = maxx;

vertices[3] = miny;

vertices[4] = minx;

vertices[5] = maxy;

vertices[6] = maxx;

vertices[7] = maxy;

data->glVertexPointer(2, GL_SHORT, 0, vertices);

data->glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);

}

return 0;

}

static int

GLES_RenderCopy(SDL_Renderer * renderer, SDL_Texture * texture,

const SDL_Rect * srcrect, const SDL_Rect * dstrect)

{

GLES_RenderData *data = (GLES_RenderData *) renderer->driverdata;

GLES_TextureData *texturedata = (GLES_TextureData *) texture->driverdata;

int minx, miny, maxx, maxy;

GLfloat minu, maxu, minv, maxv;

int i;

void *temp_buffer; /* used for reformatting dirty rect pixels */

void *temp_ptr;

GLES_ActivateRenderer(renderer);

data->glEnable(GL_TEXTURE_2D);

data->glBindTexture(texturedata->type, texturedata->texture);

if (texture->modMode) {

data->glColor4f((GLfloat) texture->r * inv255f,

(GLfloat) texture->g * inv255f,

(GLfloat) texture->b * inv255f,

(GLfloat) texture->a * inv255f);

} else {

data->glColor4f(1.0f, 1.0f, 1.0f, 1.0f);

}

GLES_SetBlendMode(data, texture->blendMode);

if (data->GL_OES_draw_texture_supported && data->useDrawTexture) {

/* this code is a little funny because the viewport is upside down vs SDL's coordinate system */

GLint cropRect[4];

int w, h;

SDL_Window *window = renderer->window;

SDL_GetWindowSize(window, &w, &h);

cropRect[0] = srcrect->x;

cropRect[1] = srcrect->y + srcrect->h;

cropRect[2] = srcrect->w;

cropRect[3] = -srcrect->h;

data->glTexParameteriv(GL_TEXTURE_2D, GL_TEXTURE_CROP_RECT_OES,

cropRect);

data->glDrawTexiOES(dstrect->x, h - dstrect->y - dstrect->h, 0,

dstrect->w, dstrect->h);

} else {

minx = dstrect->x;

miny = dstrect->y;

maxx = dstrect->x + dstrect->w;

maxy = dstrect->y + dstrect->h;

minu = (GLfloat) srcrect->x / texture->w;

minu *= texturedata->texw;

maxu = (GLfloat) (srcrect->x + srcrect->w) / texture->w;

maxu *= texturedata->texw;

minv = (GLfloat) srcrect->y / texture->h;

minv *= texturedata->texh;

maxv = (GLfloat) (srcrect->y + srcrect->h) / texture->h;

maxv *= texturedata->texh;

GLshort vertices[8];

GLfloat texCoords[8];

vertices[0] = minx;

vertices[1] = miny;

vertices[2] = maxx;

vertices[3] = miny;

vertices[4] = minx;

vertices[5] = maxy;

vertices[6] = maxx;

vertices[7] = maxy;

texCoords[0] = minu;

texCoords[1] = minv;

texCoords[2] = maxu;

texCoords[3] = minv;

texCoords[4] = minu;

texCoords[5] = maxv;

texCoords[6] = maxu;

texCoords[7] = maxv;

data->glVertexPointer(2, GL_SHORT, 0, vertices);

data->glTexCoordPointer(2, GL_FLOAT, 0, texCoords);

data->glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);

}

data->glDisable(GL_TEXTURE_2D);

return 0;

}

static void

GLES_RenderPresent(SDL_Renderer * renderer)

{

GLES_ActivateRenderer(renderer);

SDL_GL_SwapWindow(renderer->window);

}

static void

GLES_DestroyTexture(SDL_Renderer * renderer, SDL_Texture * texture)

{

GLES_TextureData *data = (GLES_TextureData *) texture->driverdata;

GLES_ActivateRenderer(renderer);

if (!data) {

return;

}

if (data->texture) {

glDeleteTextures(1, &data->texture);

}

if (data->pixels) {

SDL_free(data->pixels);

}

SDL_free(data);

texture->driverdata = NULL;

}

static void

GLES_DestroyRenderer(SDL_Renderer * renderer)

{

GLES_RenderData *data = (GLES_RenderData *) renderer->driverdata;

if (data) {

if (data->context) {

SDL_GL_DeleteContext(data->context);

}

SDL_free(data);

}

SDL_free(renderer);

}

#endif /* SDL_VIDEO_RENDER_OGL_ES */

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