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font trasparente e resize della finestra

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This commit is contained in:
Alessandro Mauri 2023-01-26 18:21:19 +01:00
parent e0e89d0f2b
commit 938e2434e4
Signed by: alema
GPG Key ID: 2B7BF9531FF03BE8
3 changed files with 22 additions and 9 deletions

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opengl-ren/charmap.ff
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opengl-ren/charmap.png
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Side by Side Swipe Overlay

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(image error) Size: 1.0 KiB

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(image error) Size: 862 B

31
opengl-ren/main.c
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@ -1,3 +1,4 @@
#include <SDL2/SDL_events.h>
#include <stddef.h>
#define _POSIX_C_SOURCE 200809l
@ -113,7 +114,7 @@ int vstack_push_quad_c(int x, int y, int w, int h, vec4 color)
// x1,y1 x2,y2
int hw = w_width(ren.w)/2;
int hh = w_width(ren.w)/2;
int hh = w_height(ren.w)/2;
float x1, x2, x3, x4;
float y1, y2, y3, y4;
@ -152,7 +153,7 @@ int vstack_push_quad_t(int x, int y, int w, int h, int u, int v)
// x1,y1 x2,y2
int hw = w_width(ren.w)/2;
int hh = w_width(ren.w)/2;
int hh = w_height(ren.w)/2;
float x1, x2, x3, x4;
float y1, y2, y3, y4;
@ -343,6 +344,9 @@ void ren_initshaders()
void ren_drawvertbuffer()
{
glBindBuffer(GL_ARRAY_BUFFER, ren.gl_vertbuffer);
// upload vertex data
glBufferData(GL_ARRAY_BUFFER, vstack.idx*sizeof(struct vertex), vstack.v, GL_DYNAMIC_DRAW);
// draw vertex data
glDrawArrays(GL_TRIANGLES, 0, vstack.idx);
glBindBuffer(GL_ARRAY_BUFFER, 0);
}
@ -437,13 +441,11 @@ int main (void)
import_font("./charmap.ff");
vec4 magenta = {.r=1.0, .g=0.0, .b=1.0, .a=1.0};
vstack_push_quad_c(0, 0, 100, 100, magenta);
vstack_push_quad_c(200, 0, 10, 10, magenta);
vstack_push_quad_c(10, 150, 100, 100, magenta);
push_text(250, 250, "ò Ciao Victoria <3");
ren_initvertbuffer();
glClearColor(0.3f, 0.3f, 0.3f, 0.f);
// event loop and drawing
SDL_Event ev = {0};
int running = 1;
@ -451,22 +453,33 @@ int main (void)
SDL_WaitEvent(&ev);
switch (ev.type) {
case SDL_QUIT: running = 0; break;
case SDL_WINDOWEVENT:
glClear(GL_COLOR_BUFFER_BIT);
if(ev.window.event == SDL_WINDOWEVENT_SIZE_CHANGED) {
glViewport(0, 0, w_width(ren.w), w_height(ren.w));
glScissor(0, 0, w_width(ren.w), w_height(ren.w));
}
break;
default: break;
}
glViewport(0, 0, w_width(ren.w), w_height(ren.w));
glClearColor(0.f, 0.f, 0.f, 0.f);
glClear(GL_COLOR_BUFFER_BIT);
vstack_push_quad_c(0, 0, 100, 100, magenta);
vstack_push_quad_c(200, 0, 10, 10, magenta);
vstack_push_quad_c(10, 150, 100, 100, magenta);
push_text(250, 250, "ò Ciao Victoria <3");
ren_drawvertbuffer();
SDL_GL_SwapWindow(ren.w);
vstack_clear();
} while(running);
glUseProgram(0);
glDisableVertexAttribArray(vertindex);
glDisableVertexAttribArray(colindex);
glDeleteTextures(1, &ren.font_texture);
SDL_GL_DeleteContext(ren.gl);
SDL_DestroyWindow(ren.w);
SDL_Quit();