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Modified triangle.c from raspberry pi, showing significant slowdown with draw calls.
/*
Copyright (c) 2012, Broadcom Europe Ltd
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
* Neither the name of the copyright holder nor the
names of its contributors may be used to endorse or promote products
derived from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
// A rotating cube rendered with OpenGL|ES. Three images used as textures on the cube faces.
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <assert.h>
#include <unistd.h>
#include "bcm_host.h"
#include "GLES/gl.h"
#include "EGL/egl.h"
#include "EGL/eglext.h"
#include "cube_texture_and_coords.h"
#define PATH "./"
#define IMAGE_SIZE 128
#ifndef M_PI
#define M_PI 3.141592654
#endif
typedef struct
{
uint32_t screen_width;
uint32_t screen_height;
// OpenGL|ES objects
DISPMANX_DISPLAY_HANDLE_T dispman_display;
DISPMANX_ELEMENT_HANDLE_T dispman_element;
EGLDisplay display;
EGLSurface surface;
EGLContext context;
GLuint tex[6];
// model rotation vector and direction
GLfloat rot_angle_x_inc;
GLfloat rot_angle_y_inc;
GLfloat rot_angle_z_inc;
// current model rotation angles
GLfloat rot_angle_x;
GLfloat rot_angle_y;
GLfloat rot_angle_z;
// current distance from camera
GLfloat distance;
GLfloat distance_inc;
// pointers to texture buffers
char *tex_buf1;
char *tex_buf2;
char *tex_buf3;
} CUBE_STATE_T;
static void init_ogl(CUBE_STATE_T *state);
static void init_model_proj(CUBE_STATE_T *state);
static void reset_model(CUBE_STATE_T *state);
static GLfloat inc_and_wrap_angle(GLfloat angle, GLfloat angle_inc);
static GLfloat inc_and_clip_distance(GLfloat distance, GLfloat distance_inc);
static void redraw_scene(CUBE_STATE_T *state);
static void update_model(CUBE_STATE_T *state);
static void init_textures(CUBE_STATE_T *state);
static void load_tex_images(CUBE_STATE_T *state);
static void exit_func(void);
static volatile int terminate;
static CUBE_STATE_T _state, *state=&_state;
/***********************************************************
* Name: init_ogl
*
* Arguments:
* CUBE_STATE_T *state - holds OGLES model info
*
* Description: Sets the display, OpenGL|ES context and screen stuff
*
* Returns: void
*
***********************************************************/
static void init_ogl(CUBE_STATE_T *state)
{
int32_t success = 0;
EGLBoolean result;
EGLint num_config;
static EGL_DISPMANX_WINDOW_T nativewindow;
DISPMANX_UPDATE_HANDLE_T dispman_update;
VC_RECT_T dst_rect;
VC_RECT_T src_rect;
static const EGLint attribute_list[] =
{
EGL_RED_SIZE, 8,
EGL_GREEN_SIZE, 8,
EGL_BLUE_SIZE, 8,
EGL_ALPHA_SIZE, 8,
EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
EGL_NONE
};
EGLConfig config;
// get an EGL display connection
state->display = eglGetDisplay(EGL_DEFAULT_DISPLAY);
printf( "Display: %d\n", state->display );
assert(state->display!=EGL_NO_DISPLAY);
// initialize the EGL display connection
result = eglInitialize(state->display, NULL, NULL);
assert(EGL_FALSE != result);
// get an appropriate EGL frame buffer configuration
result = eglChooseConfig(state->display, attribute_list, &config, 1, &num_config);
printf( "Config: %d\n", num_config );
assert(EGL_FALSE != result);
static const EGLint context_attribute_list[] = {
EGL_CONTEXT_CLIENT_VERSION, 2,
EGL_NONE
};
// create an EGL rendering context
state->context = eglCreateContext(state->display, config, EGL_NO_CONTEXT, 0);
printf( "CONTEXT: %d\n", state->context );
assert(state->context!=EGL_NO_CONTEXT);
// create an EGL window surface
// success = graphics_get_display_size(0 /* LCD */, &state->screen_width, &state->screen_height);
// assert( success >= 0 );
state->screen_width = 2160;
state->screen_height = 1200;
printf( "%d %d\n", state->screen_width, state->screen_height );
state->screen_width = 2048;
dst_rect.x = 56;
dst_rect.y = 0;
dst_rect.width = state->screen_width;
dst_rect.height = state->screen_height;
src_rect.x = 0;
src_rect.y = 0;
src_rect.width = state->screen_width << 16;
src_rect.height = state->screen_height << 16;
state->dispman_display = vc_dispmanx_display_open( 0 /* LCD */);
dispman_update = vc_dispmanx_update_start( 0 );
state->dispman_element = vc_dispmanx_element_add ( dispman_update, state->dispman_display,
0/*layer*/, &dst_rect, 0/*src*/,
&src_rect, DISPMANX_PROTECTION_NONE, 0 /*alpha*/, 0/*clamp*/, 0/*transform*/);
nativewindow.element = state->dispman_element;
nativewindow.width = state->screen_width;
nativewindow.height = state->screen_height;
vc_dispmanx_update_submit_sync( dispman_update );
static EGLint window_attribute_list[] = {
EGL_NONE
};
state->surface = eglCreateWindowSurface( state->display, config, &nativewindow,
window_attribute_list);
assert(state->surface != EGL_NO_SURFACE);
// connect the context to the surface
result = eglMakeCurrent(state->display, state->surface, state->surface, state->context);
assert(EGL_FALSE != result);
// Set background color and clear buffers
glClearColor(0.15f, 0.25f, 0.35f, 1.0f);
// Enable back face culling.
glEnable(GL_CULL_FACE);
glMatrixMode(GL_MODELVIEW);
}
/***********************************************************
* Name: init_model_proj
*
* Arguments:
* CUBE_STATE_T *state - holds OGLES model info
*
* Description: Sets the OpenGL|ES model to default values
*
* Returns: void
*
***********************************************************/
static void init_model_proj(CUBE_STATE_T *state)
{
float nearp = 1.0f;
float farp = 500.0f;
float hht;
float hwd;
glHint( GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST );
glViewport(0, 0, (GLsizei)state->screen_width, (GLsizei)state->screen_height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
hht = nearp * (float)tan(45.0 / 2.0 / 180.0 * M_PI);
hwd = hht * (float)state->screen_width / (float)state->screen_height;
glFrustumf(-hwd, hwd, -hht, hht, nearp, farp);
glEnableClientState( GL_VERTEX_ARRAY );
glVertexPointer( 3, GL_BYTE, 0, quadx );
reset_model(state);
}
/***********************************************************
* Name: reset_model
*
* Arguments:
* CUBE_STATE_T *state - holds OGLES model info
*
* Description: Resets the Model projection and rotation direction
*
* Returns: void
*
***********************************************************/
static void reset_model(CUBE_STATE_T *state)
{
// reset model position
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glTranslatef(0.f, 0.f, -50.f);
// reset model rotation
state->rot_angle_x = 45.f; state->rot_angle_y = 30.f; state->rot_angle_z = 0.f;
state->rot_angle_x_inc = 0.5f; state->rot_angle_y_inc = 0.5f; state->rot_angle_z_inc = 0.f;
state->distance = 40.f;
}
/***********************************************************
* Name: update_model
*
* Arguments:
* CUBE_STATE_T *state - holds OGLES model info
*
* Description: Updates model projection to current position/rotation
*
* Returns: void
*
***********************************************************/
static void update_model(CUBE_STATE_T *state)
{
// update position
state->rot_angle_x = inc_and_wrap_angle(state->rot_angle_x, state->rot_angle_x_inc);
state->rot_angle_y = inc_and_wrap_angle(state->rot_angle_y, state->rot_angle_y_inc);
state->rot_angle_z = inc_and_wrap_angle(state->rot_angle_z, state->rot_angle_z_inc);
state->distance = inc_and_clip_distance(state->distance, state->distance_inc);
glLoadIdentity();
// move camera back to see the cube
glTranslatef(0.f, 0.f, -state->distance);
// Rotate model to new position
glRotatef(state->rot_angle_x, 1.f, 0.f, 0.f);
glRotatef(state->rot_angle_y, 0.f, 1.f, 0.f);
glRotatef(state->rot_angle_z, 0.f, 0.f, 1.f);
}
/***********************************************************
* Name: inc_and_wrap_angle
*
* Arguments:
* GLfloat angle current angle
* GLfloat angle_inc angle increment
*
* Description: Increments or decrements angle by angle_inc degrees
* Wraps to 0 at 360 deg.
*
* Returns: new value of angle
*
***********************************************************/
static GLfloat inc_and_wrap_angle(GLfloat angle, GLfloat angle_inc)
{
angle += angle_inc;
if (angle >= 360.0)
angle -= 360.f;
else if (angle <=0)
angle += 360.f;
return angle;
}
/***********************************************************
* Name: inc_and_clip_distance
*
* Arguments:
* GLfloat distance current distance
* GLfloat distance_inc distance increment
*
* Description: Increments or decrements distance by distance_inc units
* Clips to range
*
* Returns: new value of angle
*
***********************************************************/
static GLfloat inc_and_clip_distance(GLfloat distance, GLfloat distance_inc)
{
distance += distance_inc;
if (distance >= 120.0f)
distance = 120.f;
else if (distance <= 40.0f)
distance = 40.0f;
return distance;
}
/***********************************************************
* Name: redraw_scene
*
* Arguments:
* CUBE_STATE_T *state - holds OGLES model info
*
* Description: Draws the model and calls eglSwapBuffers
* to render to screen
*
* Returns: void
*
***********************************************************/
static void redraw_scene(CUBE_STATE_T *state)
{
// Start with a clear screen
glClear( GL_COLOR_BUFFER_BIT );
// Draw first (front) face:
// Bind texture surface to current vertices
glBindTexture(GL_TEXTURE_2D, state->tex[0]);
// Need to rotate textures - do this by rotating each cube face
glRotatef(270.f, 0.f, 0.f, 1.f ); // front face normal along z axis
//XXX MODDED To make more draw calls.
int x, y;
for( y= 0; y < 20; y++ )
{
glPushMatrix();
glTranslatef( (y-10)*10, 0, 0 );
for( x = 0; x < 20; x++ )
{
glPushMatrix();
glTranslatef( 0, (x-10)*10, 0 );
glScalef( 0.05, 0.05, 0.05 ); //Make boxes really small to make sure it's not fill rate.
// draw first 4 vertices
glDrawArrays( GL_TRIANGLE_STRIP, 0, 4);
// same pattern for other 5 faces - rotation chosen to make image orientation 'nice'
glBindTexture(GL_TEXTURE_2D, state->tex[1]);
glRotatef(90.f, 0.f, 0.f, 1.f ); // back face normal along z axis
glDrawArrays( GL_TRIANGLE_STRIP, 4, 4);
glBindTexture(GL_TEXTURE_2D, state->tex[2]);
glRotatef(90.f, 1.f, 0.f, 0.f ); // left face normal along x axis
glDrawArrays( GL_TRIANGLE_STRIP, 8, 4);
glBindTexture(GL_TEXTURE_2D, state->tex[3]);
glRotatef(90.f, 1.f, 0.f, 0.f ); // right face normal along x axis
glDrawArrays( GL_TRIANGLE_STRIP, 12, 4);
glBindTexture(GL_TEXTURE_2D, state->tex[4]);
glRotatef(270.f, 0.f, 1.f, 0.f ); // top face normal along y axis
glDrawArrays( GL_TRIANGLE_STRIP, 16, 4);
glBindTexture(GL_TEXTURE_2D, state->tex[5]);
glRotatef(90.f, 0.f, 1.f, 0.f ); // bottom face normal along y axis
glDrawArrays( GL_TRIANGLE_STRIP, 20, 4);
glPopMatrix();
}
glPopMatrix();
}
printf( "." ); fflush( stdout ); //Used in conjunction with PV to determine FPS.
eglSwapBuffers(state->display, state->surface);
}
/***********************************************************
* Name: init_textures
*
* Arguments:
* CUBE_STATE_T *state - holds OGLES model info
*
* Description: Initialise OGL|ES texture surfaces to use image
* buffers
*
* Returns: void
*
***********************************************************/
static void init_textures(CUBE_STATE_T *state)
{
// load three texture buffers but use them on six OGL|ES texture surfaces
load_tex_images(state);
glGenTextures(6, &state->tex[0]);
// setup first texture
glBindTexture(GL_TEXTURE_2D, state->tex[0]);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, IMAGE_SIZE, IMAGE_SIZE, 0,
GL_RGB, GL_UNSIGNED_BYTE, state->tex_buf1);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, (GLfloat)GL_NEAREST);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, (GLfloat)GL_NEAREST);
// setup second texture - reuse first image
glBindTexture(GL_TEXTURE_2D, state->tex[1]);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, IMAGE_SIZE, IMAGE_SIZE, 0,
GL_RGB, GL_UNSIGNED_BYTE, state->tex_buf1);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, (GLfloat)GL_NEAREST);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, (GLfloat)GL_NEAREST);
// third texture
glBindTexture(GL_TEXTURE_2D, state->tex[2]);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, IMAGE_SIZE, IMAGE_SIZE, 0,
GL_RGB, GL_UNSIGNED_BYTE, state->tex_buf2);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, (GLfloat)GL_NEAREST);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, (GLfloat)GL_NEAREST);
// fourth texture - reuse second image
glBindTexture(GL_TEXTURE_2D, state->tex[3]);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, IMAGE_SIZE, IMAGE_SIZE, 0,
GL_RGB, GL_UNSIGNED_BYTE, state->tex_buf2);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, (GLfloat)GL_NEAREST);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, (GLfloat)GL_NEAREST);
//fifth texture
glBindTexture(GL_TEXTURE_2D, state->tex[4]);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, IMAGE_SIZE, IMAGE_SIZE, 0,
GL_RGB, GL_UNSIGNED_BYTE, state->tex_buf3);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, (GLfloat)GL_NEAREST);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, (GLfloat)GL_NEAREST);
// sixth texture - reuse third image
glBindTexture(GL_TEXTURE_2D, state->tex[5]);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, IMAGE_SIZE, IMAGE_SIZE, 0,
GL_RGB, GL_UNSIGNED_BYTE, state->tex_buf3);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, (GLfloat)GL_NEAREST);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, (GLfloat)GL_NEAREST);
// setup overall texture environment
glTexCoordPointer(2, GL_FLOAT, 0, texCoords);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
glEnable(GL_TEXTURE_2D);
}
/***********************************************************
* Name: load_tex_images
*
* Arguments:
* void
*
* Description: Loads three raw images to use as textures on faces
*
* Returns: void
*
***********************************************************/
static void load_tex_images(CUBE_STATE_T *state)
{
FILE *tex_file1 = NULL, *tex_file2=NULL, *tex_file3 = NULL;
int bytes_read, image_sz = IMAGE_SIZE*IMAGE_SIZE*3;
state->tex_buf1 = malloc(image_sz);
state->tex_buf2 = malloc(image_sz);
state->tex_buf3 = malloc(image_sz);
tex_file1 = fopen(PATH "Lucca_128_128.raw", "rb");
if (tex_file1 && state->tex_buf1)
{
bytes_read=fread(state->tex_buf1, 1, image_sz, tex_file1);
assert(bytes_read == image_sz); // some problem with file?
fclose(tex_file1);
}
tex_file2 = fopen(PATH "Djenne_128_128.raw", "rb");
if (tex_file2 && state->tex_buf2)
{
bytes_read=fread(state->tex_buf2, 1, image_sz, tex_file2);
assert(bytes_read == image_sz); // some problem with file?
fclose(tex_file2);
}
tex_file3 = fopen(PATH "Gaudi_128_128.raw", "rb");
if (tex_file3 && state->tex_buf3)
{
bytes_read=fread(state->tex_buf3, 1, image_sz, tex_file3);
assert(bytes_read == image_sz); // some problem with file?
fclose(tex_file3);
}
}
//------------------------------------------------------------------------------
static void exit_func(void)
// Function to be passed to atexit().
{
DISPMANX_UPDATE_HANDLE_T dispman_update;
int s;
// clear screen
glClear( GL_COLOR_BUFFER_BIT );
eglSwapBuffers(state->display, state->surface);
glDeleteTextures(6, state->tex);
eglDestroySurface( state->display, state->surface );
dispman_update = vc_dispmanx_update_start( 0 );
s = vc_dispmanx_element_remove(dispman_update, state->dispman_element);
assert(s == 0);
vc_dispmanx_update_submit_sync( dispman_update );
s = vc_dispmanx_display_close(state->dispman_display);
assert (s == 0);
// Release OpenGL resources
eglMakeCurrent( state->display, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT );
eglDestroyContext( state->display, state->context );
eglTerminate( state->display );
// release texture buffers
free(state->tex_buf1);
free(state->tex_buf2);
free(state->tex_buf3);
printf("\ncube closed\n");
} // exit_func()
//==============================================================================
int main ()
{
bcm_host_init();
// Clear application state
memset( state, 0, sizeof( *state ) );
// Start OGLES
init_ogl(state);
// Setup the model world
init_model_proj(state);
// initialise the OGLES texture(s)
init_textures(state);
while (!terminate)
{
update_model(state);
redraw_scene(state);
}
exit_func();
return 0;
}
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