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-rw-r--r--src/main.c22
-rw-r--r--src/main.h2
-rw-r--r--src/scene01.c153
-rw-r--r--src/scene01.h2
4 files changed, 154 insertions, 25 deletions
diff --git a/src/main.c b/src/main.c
index a73bf44..3f18052 100644
--- a/src/main.c
+++ b/src/main.c
@@ -77,28 +77,10 @@ int main(void)
if ( ge.sdl_target == NULL ) return 9;
ge.raw_target = malloc(256*256*4);
if ( ge.raw_target == NULL ) return 10;
- ge.gl_ctx = SDL_GL_CreateContext(ge.sdl_win);
- if ( ge.gl_ctx == NULL ) return 11;
-
// Initialize OpenGL
- glShadeModel(GL_SMOOTH);
- glClearDepth(1.0f);
- glEnable(GL_DEPTH_TEST);
- glDepthFunc(GL_LEQUAL);
- glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
- glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);
-
- glDisable(GL_TEXTURE_2D);
- glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
- glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
- glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
- glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
- glEnable(GL_CULL_FACE);
- glCullFace(GL_FRONT);
- glViewport(0, 0, (GLsizei)256, (GLsizei)256);
- glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluPerspective(45.0f, 1.0f, 0.1f, 100.0f); // 1.0f==ratio
- glMatrixMode(GL_MODELVIEW); glLoadIdentity();
+ ge.gl_ctx = SDL_GL_CreateContext(ge.sdl_win);
+ if ( ge.gl_ctx == NULL ) return 11;
// Main libcaca loop for caca window (OpenGL could be used in sceneN_next())
ge.framecount=0;
diff --git a/src/main.h b/src/main.h
index b2b0a6e..1ff41ec 100644
--- a/src/main.h
+++ b/src/main.h
@@ -1,6 +1,8 @@
#ifndef MAIN_H_INCLUDED
#define MAIN_H_INCLUDED
+#define GL_GLEXT_PROTOTYPES
+
#include <caca.h>
#include <SDL2/SDL.h>
#include <SDL2/SDL_opengl.h>
diff --git a/src/scene01.c b/src/scene01.c
index 2b3e9f5..80cbae2 100644
--- a/src/scene01.c
+++ b/src/scene01.c
@@ -19,11 +19,140 @@
*/
#include "scene01.h"
+// Mostly inspired by CC0 https://gist.github.com/koute/7391344
+typedef float t_mat4x4[16];
+
+static inline void mat4x4_ortho( t_mat4x4 out, float left, float right, float bottom, float top, float znear, float zfar )
+{
+ #define T(a, b) (a * 4 + b)
+
+ out[T(0,0)] = 2.0f / (right - left);
+ out[T(0,1)] = 0.0f;
+ out[T(0,2)] = 0.0f;
+ out[T(0,3)] = 0.0f;
+
+ out[T(1,1)] = 2.0f / (top - bottom);
+ out[T(1,0)] = 0.0f;
+ out[T(1,2)] = 0.0f;
+ out[T(1,3)] = 0.0f;
+
+ out[T(2,2)] = -2.0f / (zfar - znear);
+ out[T(2,0)] = 0.0f;
+ out[T(2,1)] = 0.0f;
+ out[T(2,3)] = 0.0f;
+
+ out[T(3,0)] = -(right + left) / (right - left);
+ out[T(3,1)] = -(top + bottom) / (top - bottom);
+ out[T(3,2)] = -(zfar + znear) / (zfar - znear);
+ out[T(3,3)] = 1.0f;
+
+ #undef T
+}
+
+static const char * vertex_shader =
+ "#version 130\n"
+ "in vec2 i_position;\n"
+ "in vec4 i_color;\n"
+ "out vec4 v_color;\n"
+ "uniform mat4 u_projection_matrix;\n"
+ "void main() {\n"
+ " v_color = i_color;\n"
+ " gl_Position = u_projection_matrix * vec4( i_position, 0.0, 1.0 );\n"
+ "}\n";
+
+static const char * fragment_shader =
+ "#version 130\n"
+ "in vec4 v_color;\n"
+ "out vec4 o_color;\n"
+ "void main() {\n"
+ " o_color = v_color;\n"
+ "}\n";
+
+typedef enum t_attrib_id
+{
+ attrib_position,
+ attrib_color
+} t_attrib_id;
+
int scene01_init(graphical_env_t *ge, scene01_env_t *se) {
+ int width = 256, height = 256;
+ GLuint vs, fs, program;
+
+ vs = glCreateShader( GL_VERTEX_SHADER );
+ fs = glCreateShader( GL_FRAGMENT_SHADER );
+
+ int length = strlen( vertex_shader );
+ glShaderSource( vs, 1, ( const GLchar ** )&vertex_shader, &length );
+ glCompileShader( vs );
+
+ GLint status;
+ glGetShaderiv( vs, GL_COMPILE_STATUS, &status );
+ if( status == GL_FALSE )
+ {
+ fprintf( stderr, "vertex shader compilation failed\n" );
+ return 1;
+ }
+
+ length = strlen( fragment_shader );
+ glShaderSource( fs, 1, ( const GLchar ** )&fragment_shader, &length );
+ glCompileShader( fs );
+
+ glGetShaderiv( fs, GL_COMPILE_STATUS, &status );
+ if( status == GL_FALSE )
+ {
+ fprintf( stderr, "fragment shader compilation failed\n" );
+ return 1;
+ }
+
+ program = glCreateProgram();
+ glAttachShader( program, vs );
+ glAttachShader( program, fs );
+
+ glBindAttribLocation( program, attrib_position, "i_position" );
+ glBindAttribLocation( program, attrib_color, "i_color" );
+ glLinkProgram( program );
+
+ glUseProgram( program );
+
+ glDisable( GL_DEPTH_TEST );
+ //glClearColor( 0.5, 0.0, 0.0, 0.0 );
+ glClearColor( 0.5, 0.5, 0.0, 0.0 );
+ glViewport( 0, 0, width, height );
+
+ GLuint vbo;
+
+ glGenVertexArrays( 1, &(se->vao) );
+ glGenBuffers( 1, &vbo );
+ glBindVertexArray( se->vao );
+ glBindBuffer( GL_ARRAY_BUFFER, vbo );
+
+ glEnableVertexAttribArray( attrib_position );
+ glEnableVertexAttribArray( attrib_color );
+
+ glVertexAttribPointer( attrib_color, 4, GL_FLOAT, GL_FALSE, sizeof( float ) * 6, 0 );
+ glVertexAttribPointer( attrib_position, 2, GL_FLOAT, GL_FALSE, sizeof( float ) * 6, ( void * )(4 * sizeof(float)) );
+
+ const GLfloat g_vertex_buffer_data[] = {
+ /* R, G, B, A, X, Y */
+ 1, 0, 0, 1, 0, 0,
+ 0, 1, 0, 1, width, 0,
+ 0, 0, 1, 1, width, height,
+
+ 1, 0, 0, 1, 0, 0,
+ 0, 0, 1, 1, width, height,
+ 1, 1, 1, 1, 0, height
+ };
+
+ glBufferData( GL_ARRAY_BUFFER, sizeof( g_vertex_buffer_data ), g_vertex_buffer_data, GL_STATIC_DRAW );
+
+ t_mat4x4 projection_matrix;
+ mat4x4_ortho( projection_matrix, 0.0f, (float)width, (float)height, 0.0f, 0.0f, 100.0f );
+ glUniformMatrix4fv( glGetUniformLocation( program, "u_projection_matrix" ), 1, GL_FALSE, projection_matrix );
return 0;
}
void scene01_free(graphical_env_t *ge, scene01_env_t *se) {
+ //FIXME scene00 cannot be rendered coorectly after scene01_init done once
}
int scene01_next(graphical_env_t *ge, scene01_env_t *se) {
@@ -31,13 +160,29 @@ int scene01_next(graphical_env_t *ge, scene01_env_t *se) {
caca_canvas_t *cv = ge->cv;
int w = ge->w, h = ge->h;
Uint32 frame = ge->sc_framecount;
+ SDL_Renderer *r = ge->sdl_rndr;
+ // Locals
+ int res;
+
+ // Render all the stuff on target texture
+ //SDL_SetRenderTarget(r, ge->sdl_target);
+
+ glClear( GL_COLOR_BUFFER_BIT );
+ glBindVertexArray( se->vao );
+ glDrawArrays( GL_TRIANGLES, 0, 6 );
+ SDL_GL_SwapWindow( ge->sdl_win );
- //XXX remove me
- ((Uint32 *)ge->raw_target)[frame%(256*256)]=frame<<((frame%3)*8);
+ // Copy the SDL screen to SDL debug window (and display it, not mandatory)
+ //SDL_SetRenderTarget(r, NULL);
+ //SDL_RenderCopy(r, ge->sdl_target, NULL, NULL);
+ //SDL_RenderPresent(r);
+
+ // Download the rendered texture from videocard to main memory
+ res = SDL_RenderReadPixels(r, NULL, 0, ge->raw_target, 256*4);
- caca_clear_canvas(cv);
+ // "convert" the raw pixel stream to ASCII art on caca canevas
caca_set_dither_gamma(ge->d, (100-frame%100)/100.0);
- caca_dither_bitmap(cv, 0, 0, w, h, ge->d, ge->raw_target);
+ if ( res == 0 ) caca_dither_bitmap(cv, 0, 0, w, h, ge->d, ge->raw_target);
caca_set_color_ansi(cv, CACA_WHITE, CACA_BLACK);
caca_put_str(cv, (w-17)/2, h/2, "This is a message");
diff --git a/src/scene01.h b/src/scene01.h
index 1f22de7..ecad8df 100644
--- a/src/scene01.h
+++ b/src/scene01.h
@@ -3,7 +3,7 @@
#include "main.h"
typedef struct {
-
+ GLuint vao;
} scene01_env_t;
int scene01_init(graphical_env_t *ge, scene01_env_t *se);
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-22 16:07:24 +0000